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<div class="sect1" title="$cache_lifetime">
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<a name="variable.cache.lifetime"></a>$cache_lifetime</h2></div></div></div>
<p>
     This is the length of time in seconds that a template cache is valid.
     Once this time has expired, the cache will be regenerated.
     </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
      <em class="parameter"><code>$caching</code></em> must be turned on (either Smarty::CACHING_LIFETIME_CURRENT or Smarty::CACHING_LIFETIME_SAVED) for
     <em class="parameter"><code>$cache_lifetime</code></em> to have any purpose.
     </p></li>
<li class="listitem"><p>
     A <em class="parameter"><code>$cache_lifetime</code></em> value of -1 will force the cache to never expire.
     </p></li>
<li class="listitem"><p>A value of 0 will cause
     the cache to always regenerate (good for testing only, to disable caching
     a more efficient method is to set <a class="link" href="variable.caching.html" title="$caching"><em class="parameter"><code>$caching</code></em></a> = Smarty::CACHING_OFF).
    </p></li>
<li class="listitem"><p>      If you want to give certain templates their own cache lifetime,
      you could
      do this by setting <a class="link" href="variable.caching.html" title="$caching">
       <em class="parameter"><code>$caching</code></em></a> = Smarty::CACHING_LIFETIME_SAVED,
      then set <em class="parameter"><code>$cache_lifetime</code></em> to a unique value just
      before calling <a class="link" href="api.display.html" title="display()"><code class="varname">display()</code>
      </a> or <a class="link" href="api.fetch.html" title="fetch()"><code class="varname">fetch()</code></a>.
     </p></li>
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<p>
     If <a class="link" href="variable.force.compile.html" title="$force_compile">
     <em class="parameter"><code>$force_compile</code></em></a> is
     enabled, the cache files will be regenerated every time, effectively
     disabling caching. You can clear all the cache files with the <a class="link" href="api.clear.all.cache.html" title="clearAllCache()"><code class="varname">clear_all_cache()</code></a>
     function, or individual cache files (or groups) with the <a class="link" href="api.clear.cache.html" title="clearCache()"><code class="varname">clear_cache()</code></a> function.
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